HESI A2 CHEMISTRY, EXAM 2026
QUESTION AND ANSWERS
What are all metric measurements composed of? - answerMetric prefix and a basic unit
of measure
What is the most commonly used temperature scale in the scientific community? -
answerCelsius or centigrade
The nucleus of an atom contains or is made up of: - answerprotons and neutrons
What is an atom that has a positive charge? - answerCathode
In the periodic table, what are the rows called? - answerPeriods
What is the Atomic number? - answernumber of protons
What is the atomic mass? - answerAverage mass of that elements isotopes
Chemical equations are written in which matter? - answerReactants → Products
What is the charge on potassium in the compound KCl - answer+1
A catalyst is a substance that accelerates a reaction by which of the following? -
answerFinding an alternate pathway for a reaction that requires less energy.
Percent concentration of a solution is expressed: - answerparts per 100 parts
What will 1 Liter of a 1 molar solution of any element contain: - answerThe atomic mass
in grams of that element
Chemical bonding is the bonding of what: - answerOne atom to another atom
What is ionic bond - answerit does not share electrons
The reaction 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O has a ration of 2 parts ethane and 7 parts
oxygen. How many parts of Ethane will be needed to react with 21 parts of oxygen? -
answer6 parts of ethane
What is the concentration of 58.6 grams of NaCl in 2 Liters of solution. Atomic weights
are Na = 23g/mol, Cl = 35.5g/mol - answer0.5 mol NaCl
In a redox reaction which describes reduction? - answerIt is the gain of electrons
QUESTION AND ANSWERS
What are all metric measurements composed of? - answerMetric prefix and a basic unit
of measure
What is the most commonly used temperature scale in the scientific community? -
answerCelsius or centigrade
The nucleus of an atom contains or is made up of: - answerprotons and neutrons
What is an atom that has a positive charge? - answerCathode
In the periodic table, what are the rows called? - answerPeriods
What is the Atomic number? - answernumber of protons
What is the atomic mass? - answerAverage mass of that elements isotopes
Chemical equations are written in which matter? - answerReactants → Products
What is the charge on potassium in the compound KCl - answer+1
A catalyst is a substance that accelerates a reaction by which of the following? -
answerFinding an alternate pathway for a reaction that requires less energy.
Percent concentration of a solution is expressed: - answerparts per 100 parts
What will 1 Liter of a 1 molar solution of any element contain: - answerThe atomic mass
in grams of that element
Chemical bonding is the bonding of what: - answerOne atom to another atom
What is ionic bond - answerit does not share electrons
The reaction 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O has a ration of 2 parts ethane and 7 parts
oxygen. How many parts of Ethane will be needed to react with 21 parts of oxygen? -
answer6 parts of ethane
What is the concentration of 58.6 grams of NaCl in 2 Liters of solution. Atomic weights
are Na = 23g/mol, Cl = 35.5g/mol - answer0.5 mol NaCl
In a redox reaction which describes reduction? - answerIt is the gain of electrons
